Sheet-feeding apparatus

ABSTRACT

A sheet-feeding apparatus having simple structure and capable of single-face/double-face scanning/printing sheets at high sheet-feeding efficiency. The sheet-feeding apparatus includes a sheet-feeding path in which sheets can pass through a scanning module and/or a printing module. The sheet-feeding path includes a first passage, a second passage communicating with the first passage and a subsidiary passage formed between the first and second passages. The sheets are selectively fed into and delivered through the first passage, the second passage or the subsidiary passage to be single-face/double-face scanned/printed.

BACKGROUND OF THE INVENTION

The present invention is related to an improved sheet-feeding apparatus,and more particularly to a sheet-feeding apparatus having simplifiedsheet-feeding path for more easily single-face/double-facescanning/printing sheets at higher sheet-delivering efficiency.

There are various conventional automatic sheet-feeding apparatusesapplied to office machines for scanning/printing sheets. For example,referring to FIG. 1, Taiwanese Patent No. 92118103 discloses anautomatic sheet-feeding apparatus including a sheet-feeding cartridge aand a sheet-releasing cartridge a1. Papers can be placed on thesheet-feeding cartridge a. A paper p goes through a pick roller c and aroller set c1 into a first passage b1. A front face of the paper ppasses through a scanning module D and then moves to a first registersection e1. A guide member f1 is switched to a position as shown byphantom line to block the first passage b1 and unblock a second passageb2. The paper p goes through a roller set c2 into the second passage b2and then goes through the roller set c1 into the first passage b1 again.A back face of the paper p then passes through the scanning module D. Aguide member f2 is switched to a position as shown by phantom line tounblock the subsidiary passage b4, permitting the paper p to get into asecond register section e2. Then the guide-member f3 blocks thesubsidiary passage b4 and unblocks the third passage b3, whereby aroller set c3 drives the paper p into the third passage b3. Then aroller set c4 delivers the paper p to the releasing cartridge a1. Atthis time, the paper is double-face scanned. In a modified embodiment,the scanning module D is replaced with a printing module.

Referring to FIG. 2, Taiwanese Patent No. 95107505 discloses asingle-face/double-face continuous automatic paper feeder. The paperfeeder includes a paper-feeding cartridge g and a paper-releasingcartridge g1. Papers can be placed on the paper-feeding cartridge g. Apaper p goes through a pick roller h into a paper-feeding passage or afirst passage k1. Then the paper p goes through a roller set h1 to pushaway a leaf spring n1. Then a front face of the paper p passes through ascanning module D. Then the paper p goes through a roller set h2 into apaper-returning passage or a second passage k2. In case of single-facescanning, a guide member m1 is switched to a position as shown byphantom line to unblock a subsidiary passage k4, permitting the paper pto get into the subsidiary passage k4 and push away a leaf spring n2.Then a roller set h3 delivers the paper p to the paper-releasingcartridge g1.

In case of double-face scanning, the guide member m1 is positioned in aposition as shown by solid line to block the subsidiary passage k4.Under such circumstance, the paper p goes through the paper-returningpassage or the second passage k2 and goes through the roller set h4 topush away the leaf spring n3. Then the back face of the paper p passesthrough the scanning module D. Then the paper p gets into thepaper-releasing passage or the third passage k3 and goes through theroller sets h5, h3 to the paper-releasing cartridge g1. At this time,the paper is double-face scanned. In a modified embodiment, the scanningmodule D is replaced with a printing module.

Some shortcomings exist in the above sheet-feeding apparatuses. Forexample, the sheet-delivering path is composed of numerous passagesb1˜b4 or k1˜k4 so that the path is too long and complicated. Moreover, aplurality of roller sets c1˜c4 or h1˜h5 and guide members f1˜f3 or m1and leaf springs n1˜n3 are necessary for the sheet-delivering path tocomplete the single-face/double-face scanning operation. Also, the abovePatents fail to disclose any measure for achieving both scanning andprinting functions.

It is therefore tried by the applicant to provide an improvedsheet-feeding apparatus which includes less components and hassimplified structure. In addition, the improved sheet-feeding apparatusis capable of more easily single-face/double-face both scanning andprinting sheets at higher sheet-delivering efficiency.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide asheet-feeding apparatus having simplified sheet-feeding path fordelivering sheets at higher efficiency.

According to the above object, the sheet-feeding apparatus of thepresent invention includes a sheet-feeding path in which a sheet canpass through an image-processing section which can be a scanning moduleand/or a printing module. The sheet-feeding path includes a firstpassage, a second passage communicating with the first passage and asubsidiary passage positioned between the first and second passages. Thesheet is selectively delivered through the first passage, the secondpassage and/or the subsidiary passage to be single-face/double-facescanned/printed.

In the above sheet-feeding apparatus, the first passage has a front endsection and a rear end section and the second passage also has a frontend section and a rear end section. The rear end section of the firstpassage communicates with the front end section of the second passage.The subsidiary passage communicates with the front end section of thefirst passage and the rear end section of the second passage.

In the above sheet-feeding apparatus, when the guide member is switchedto a first position, the guide member blocks the first passage. Undersuch circumstance, the sheet passes through the subsidiary passagetoward the printing module or a sheet-releasing cartridge.

The present invention can be best understood through the followingdescription and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a conventional automatic sheet-feedingapparatus;

FIG. 2 is a side view of another conventional automatic paper-feedingapparatus;

FIG. 3 is a side view of the sheet-feeding apparatus of the presentinvention, showing that a document is single-face scanned;

FIG. 4 is a side view of the sheet-feeding apparatus of the presentinvention, showing that a document is double-face scanned;

FIG. 5 is a side view of the sheet-feeding apparatus of the presentinvention, showing that a sheet is single-face printed; and

FIG. 6 is a side view of the sheet-feeding apparatus of the presentinvention, showing that a sheet is double-face printed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 3 and 4. The sheet-feeding apparatus of thepresent invention includes a sheet-feeding path 10 in which a paper canpass through an image-processing section. The image-processing sectionis a scanning module 20 with an image sensor 21 and/or a printing module30. The sheet-feeding path 10 includes a sheet-feeding passage or afirst passage 11, a sheet-releasing passage or a second passage 12communicating with the first passage 11 and a subsidiary passage 13positioned between the first and second passages 11, 12. In thisembodiment, the first passage 11 has a front end section 14 and a rearend section 15. The second passage 12 has a front end section 16 and arear end section 17. The rear end section 15 of the first passage 11communicates with the front end section 16 of the second passage 12.

As shown in FIGS. 3 and 4, the subsidiary passage 13 communicates withthe front end section 14 of the first passage 11 and the rear endsection 17 of the second passage 12. A sheet-feeding roller 40 and areciprocally swinging guide member 50 are arranged in an entrance 18 ofthe front end section 14 of the first passage 11. Multiple roller sets41, 42, 43 are disposed in the sheet-feeding path 10.

In a preferred embodiment, the scanning module 20 is positioned betweenthe rear end section 15 of the first passage and the front end section16 of the second passage. It should be noted that the scanning module 20can be alternatively positioned in the first passage 11 or the secondpassage 12. The scanning module 20 is replaceable with a printing module30. In this embodiment, the printing module 30 is arranged in a positionnear an exit 19 of the rear end section 17 of the second passage asshown in FIGS. 3 and 4.

In a preferred embodiment, a platform 60 is arranged between the exit 19of the second passage and the printing module 30. The platform 60 has aplane face or a curved face 61 for helping in more smoothly deliveringthe sheet. Basically, the plane face or curved face 61 is located in aposition lower than the rear end section 17 of the second passage 12.

In FIG. 3, the arrows indicate the delivering path of the document to besingle-face scanned. The guide member 50 is positioned on an upper sideof the first passage 11 to unblock the first passage 11. The document isdriven by the sheet-feeding roller 40 to go into the first passage 11.After going through the rear end section 15 of the first passage and theroller set 42, the document is scanned by the scanning module 20. Thenthe document gets into the second passage 12 to be released from theexit 19 thereof. At this time, a first face of the document is scanned.It should be noted that in the case that the printing module 30 is setin an off state, the document can pass through the printing module 30 asshown in FIG. 3.

In FIG. 4, the phantom arrows indicate the delivering path of thedocument to be double-face scanned. After the document is single-facescanned as shown in FIG. 3, the document can be driven by asheet-releasing roller 31 in a reverse direction (leftward according toFIG. 4) into the subsidiary passage 13. Then the document goes into thefirst passage 11. After going through the rear end section 15 of thefirst passage and the roller set 42, the document is scanned by thescanning module 20. Then the document gets into the second passage 12 tobe released from the exit 19 thereof. At this time, a second face of thedocument is scanned.

As shown in FIG. 4, the platform 60 has a slope 62 near the rear endsection 17 of the second passage. The slope 62 is apparently lower thanthe rear end section 17 of the second passage 12, whereby the documentcan be more smoothly driven into the subsidiary passage 13.

In FIG. 5, the arrows indicate the delivering path of the sheet to besingle-face printed. The guide member 50 swings to lower side of thefirst passage 11 to block the first passage 11. The sheet is driven bythe sheet-feeding roller 40 to go into the subsidiary passage 13. Thenthe sheet goes through the exit 19 to pass through the printing module30 and printed by the printing module 30. At this time, a first face ofthe sheet is printed.

In FIG. 6, the arrows indicate the delivering path of the sheet to bedouble-face printed. After the sheet is single-face printed as shown inFIG. 5, the sheet is driven by the sheet-releasing roller 31 in areverse direction (leftward according to FIG. 6) into the subsidiarypassage 13. At this time, the guide member 50 swings back to upper sideof the first passage 11 to unblock the first passage 11. After goingthrough the rear end section 15 of the first passage and the roller set42, the sheet passes through the scanning module 20 set in an off state.Then the sheet goes into the second passage 12 to be released from theexit 19 thereof. Then a second face of the sheet is printed by theprinting module 30. At this time, the sheet is double-face printed.

According to the above arrangement, the present invention has thefollowing advantages:

-   -   1. In contrast to prior art, the sheet-feeding apparatus of the        present invention has a simplified sheet-delivering path capable        of more easily single-face/double-face both scanning and        printing sheets at higher sheet-delivering efficiency.    -   2. When scanning/printing a first face and a second face of a        sheet, a common sheet-delivering path is used. Therefore, the        complicated third passage b3 or the sheet-returning passage k2        of the conventional automatic sheet-feeding apparatus is no more        necessary.    -   3. The sheet-feeding apparatus of the present invention includes        less components (such as roller set, guide member, etc.) and has        simplified structure.

The above embodiments are only used to illustrate the present invention,not intended to limit the scope thereof. Many modifications of the aboveembodiments can be made without departing from the spirit of the presentinvention.

1. A sheet-feeding apparatus comprising a sheet-feeding path in which asheet can pass through an image-processing section, the sheet-feedingpath including a first passage, a second passage communicating with thefirst passage and a subsidiary passage positioned between the first andsecond passages, the sheet being selectively delivered through the firstpassage, the second passage and/or the subsidiary passage.
 2. Thesheet-feeding apparatus as claimed in claim 1, wherein theimage-processing section is a scanning module with an image sensor. 3.The sheet-feeding apparatus as claimed in claim 1, wherein theimage-processing section is a printing module.
 4. The sheet-feedingapparatus as claimed in claim 1, wherein the first passage has a frontend section and a rear end section and the second passage also has afront end section and a rear end section, the rear end section of thefirst passage communicating with the front end section of the secondpassage.
 5. The sheet-feeding apparatus as claimed in claim 4, whereinthe subsidiary passage communicates with the front end section of thefirst passage and the rear end section of the second passage.
 6. Thesheet-feeding apparatus as claimed in claim 4, wherein the front endsection of the first passage has an entrance, a sheet-feeding roller anda reciprocally swinging guide member being arranged in the entrance. 7.The sheet-feeding apparatus as claimed in claim 4, wherein the rear endsection of the second passage has an exit.
 8. The sheet-feedingapparatus as claimed in claim 1, wherein multiple roller sets aredisposed in the sheet-feeding path.
 9. The sheet-feeding apparatus asclaimed in claim 1, wherein the image-processing section is positionedbetween the first passage and the second passage.
 10. The sheet-feedingapparatus as claimed in claim 7, wherein the image-processing section ispositioned near the exit of the second passage.
 11. The sheet-feedingapparatus as claimed in claim 1, wherein a platform is arranged in thesheet-feeding path, the platform having a plane face or a curved face.12. The sheet-feeding apparatus as claimed in claim 11, wherein theplatform is positioned between the second passage and theimage-processing section.
 13. The sheet-feeding apparatus as claimed inclaim 11, wherein the platform has a slope near the second passage, theslope being lower than the second passage.
 14. The sheet-feedingapparatus as claimed in claim 7, wherein a sheet-releasing roller and aprinting module are arranged at the exit of the second passage.